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<html>
  <style>
  body {
    display: grid;
    grid-template-rows: auto;
    grid-template-columns: repeat(3, 150px);
  }
  summary::-moz-list-bullet {
    /* Hide the triangle for comparing with div in reftest. */
    list-style-type: none;
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  details {
    border: 1px solid lightblue;
  }
  </style>
  <body>
    <details open style="writing-mode: horizontal-tb; direction: ltr;">
      <summary>Summary</summary>
      <p>This is the details.</p>
    </details>
    <details open style="writing-mode: vertical-rl; direction: ltr;">
      <summary>Summary</summary>
      <p>This is the details.</p>
    </details>
    <details open style="writing-mode: vertical-lr; direction: ltr;">
      <summary>Summary</summary>
      <p>This is the details.</p>
    </details>
    <details open style="writing-mode: horizontal-tb; direction: rtl;">
      <summary>Summary</summary>
      <p>This is the details.</p>
    </details>
    <details open style="writing-mode: vertical-rl; direction: rtl;">
      <summary>Summary</summary>
      <p>This is the details.</p>
    </details>
    <details open style="writing-mode: vertical-lr; direction: rtl;">
      <summary>Summary</summary>
      <p>This is the details.</p>
    </details>
  </body>
</html>
